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a coal(150kg) falls at a speed of .8m/s into a coal cart(440kg) moved at .5m/s a)calculate...

a coal(150kg) falls at a speed of .8m/s into a coal cart(440kg) moved at .5m/s
a)calculate the final velocity after the coal is received
b) is mechanical enegy conserved? why or why not
c) is momentum conserved? in all 3-D planes? why or why not
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